Best way to drain concrete slab thank you!

[Colin3322]

Hi, everyone! I'm seeking your views & tips to drain a concrete slab. while keeping buildup low.

It’s a concrete deck/slab constructed using a metal deck, which will act as a roof/lid over the basement. On top of the concrete deck, will be a paved garden area.

Key points:

• The floor finish will be tiles on pedestals.
• Drains will be concealed under the tiles, allowing us to add as many drains as needed.
• Waterproofing specifications are handled by others.

My main concern is efficient water drainage to minimize the risk of seepage into the basement. I would greatly appreciate your guidance on the best placement of drains and the optimal slope for quick drainage. So far,concept as shown in the attached picture.
Thanks for any advice and tips; I really appreciate it!